发电厂电气部分设计

毕业设计（论文）

题目：发电厂电气部分设计

学院：电子信息学院

专业班级：电气工程及其自动化2009级2班指导教师：XXXXX职称：讲师

学生姓名： XXXXX

学号：XXXXXXXXXXX

摘要

水力发电厂是把水的位能和动能转换成电能的工厂，它的基本生产过程是：从河流高处或其他水库内引水，利用水的压力或流速冲动水轮机旋转，将水能转变成机械能，然后水轮机带动发电机旋转，将机械能转变成电能。

本文是对总装机容量为2X15+2X35=100MW的中小型水电厂电气部分的初步设计，主要完成了对与电厂一次系统相关方面的设计。依据丰水期和枯水期两种不同季节水流量的差异，通过任意投切组合4台2种型号水轮发电机，本电厂可以实现对水资源充分利用，将水资源的势能和动能转换成电能，并通过升压变压器将电压升高至35kV和110kV 两种电压等级，分别供给当地负荷以及并入电网系统。

全文共分八大章节，其主要内容包括电气主接线的方案的比较、选择；主变压器容量计算、台数和型号的选择；短路电流计算；高压电气设备的选择与校验；厂用电及其接线设计、厂用变压器容量计算、台数和型号的选择及厂用电动机自启动校验，并作了过电压保护和接地装置配置设计。其设计的重点在于利用水电厂运算曲线法对可能发生短路的短路点进行三相短路电流计算，以及按照正常工作条件选择电气设备，按照短路状态校验电器设备，从而实现对电气设备的选择等等。

关键词：水电厂，电气主接线，短路电流，电气设备，厂用电

ABSTRACT

Hydraulic power plant is the water potential energy and kinetic energy into electricity energy, basic production process it is: water from river heights or other reservoirs, using the water pressure or velocity impulse turbine rotation, the water energy into mechanical energy, then the turbine drives the generator to spin, and the mechanical energy can be changed into electric energy.

This paper is a preliminary design of medium and small hydropower plant electrical parts of the total installed capacity of 2X15+2X35=100MW, and mainly has completed plant design relating with aspects of primary system. Based on the difference between the dry season and the wet season of two different seasonal water flow, through an arbitrary switching combination of 2 types of 4 hydraulic turbine generator, the power plant can realize the full utilization of water resources, converting the potential energy and kinetic energy of water into electrical energy, and the voltage rises to two voltage levels of 35kV and 110kV through the step-up transformer, respectively, for local load and grid system.

The full text is divided into eight chapters, the main contents include comparison and selection of main electrical wiring scheme; calculation of main transformer capacity, including model number selection, the number of models and amounts; short-circuit current calculation; selection and validation of high voltage electrical equipment and wiring design; power plant, transformer capacity calculation, selection and plant the number of models and motor self-starting check, and the over-voltage protection and grounding device configuration design. The design focuses on the use of hydropower plant operation curve method for three-phase short-circuit current of short circuit may short-circuit calculation, and in accordance with the normal working condition selection of electrical equipment, in accordance with the short-circuit state check electrical equipment, so as to realize the electrical equipment selection etc.

Keywords: hydropower plant, the main electrical wiring, short-circuit current,